Gaps in the Grid

**Describe the bug**
There are large gaps in the grid.
**To Reproduce**
Steps to reproduce the behavior:

1. Create a grid of divs where their height is determined by the context of the div, and the "height" css property is unset.
2. Create a masonry grid
4. See gaps in the grid

**Expected behavior**
A clean grid with no gaps.

**Screenshots**

**Desktop (please complete the following information):**

- OS: macOS 12.2.1
- Browser: Chrome 99
- Version: 3.6.4

Start by reproducing the reported gaps with context-sized divs and an unset height in a masonry grid using the reported environment. Trace the masonry layout implementation to identify why spacing appears; done means the same grid renders cleanly without gaps.

Written by the indexing model from the issue text.